Commentaries:
Barnes' Notes
Not as though ... - Not as though the promise of God had entirely failed. Though I grieve thus Romans 9:2-3, though I am deeply apprehensive for the nation, yet I do not affirm that all the nation is to be destroyed. The promise of God will not entirely fail.
Not all Israel - Not all the descendants of Jacob have the true spirit of Israelites, or are Jews in the scriptural sense of the term; see the note at Romans 2:28-29.
Other Barnes' Notes entries containing Romans 9:6:
Psalms 24:6
Joel 3:2
Micah 5:3
Zephaniah 3:13
John 1:47
Galatians 6:16
Hebrews 8:8
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